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Porcelain crabs resemble true crabs, but are more closely related to squat lobsters and hermit crabs. [1]Carcinisation (American English: carcinization) is a form of convergent evolution in which non-crab crustaceans evolve a crab-like body plan.
Porcelain crabs are an example of carcinisation, whereby a noncrab-like animal (in this case a relative of a squat lobster) evolves into an animal that resembles a true crab. [5] [6] Porcelain crabs can be distinguished from true crabs by the apparent number of walking legs (three instead of four pairs; the fourth pair is reduced and held ...
In contrast to other porcelain crabs, A. spinifrons shows sexual dimorphism of the pleon (abdomen), closely resembling the situation in true crabs. [2] Females have a large pleon, similar to that of other porcelain crabs, covering almost all of the sternum. Males have a short, triangular pleon that only covers a small part of the sternum. [2]
Petrolisthes armatus, the green porcelain crab, is a species of small porcelain crab in the family Porcellanidae. It is believed to be native to Brazil but has spread to other parts of the world. Populations in the south eastern part of the United States have increased dramatically and the species is considered to be an invasive species.
Petrolisthes eriomerus is a species of marine porcelain crab found in the eastern Pacific Ocean. It is commonly known as the flattop crab. It is a flattened, rounded animal, with a carapace up to 20 mm (0.8 in) across. It is a filter feeder, and also sweeps food from rocks.
Munidopsis polymorpha is a species of squat lobster (also known as the blind albino cave crab, Jameos blind crab or jameito) that is endemic to Lanzarote, Canary Islands. They are small, blind and pale, and can be found in the caves of Jameos del Agua , in lava tubes formed by volcanic eruptions 15,000 - 13,000 years ago. [ 1 ]
Crustaceans include lobsters, crayfish, shrimp, krill, copepods, barnacles and crabs. [2] Most crustaceans are aquatic, but some can be terrestrial , sessile , or parasitic . Other names for carcinology are malacostracology , crustaceology , and crustalogy , and a person who studies crustaceans is a carcinologist or occasionally a ...
Petrolisthes cabrilloi, also known as the Cabrillo porcelain crab, is a species of crab. [1] Native to the Pacific coast of North America, it was first described to science by Steve Glassell in 1945. [2] [3] Its range is believed to be from Morro Bay to Baja California. [4]